196493487891 has 16 divisors (see below), whose sum is σ = 264137502720. Its totient is φ = 129926903040.

The previous prime is 196493487881. The next prime is 196493487893. The reversal of 196493487891 is 198784394691.

It is not a de Polignac number, because 196493487891 - 2¹⁰ = 196493486867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (196493487893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 360606 + ... + 723203.

It is an arithmetic number, because the mean of its divisors is an integer number (16508593920).

Almost surely, 2^196493487891 is an apocalyptic number.

196493487891 is a deficient number, since it is larger than the sum of its proper divisors (67644014829).

196493487891 is a wasteful number, since it uses less digits than its factorization.

196493487891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084306.

The product of its digits is 94058496, while the sum is 69.

The spelling of 196493487891 in words is "one hundred ninety-six billion, four hundred ninety-three million, four hundred eighty-seven thousand, eight hundred ninety-one".